libcore/swf/VideoFrameTag.cpp

   1 //
   2 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Free Software
   3 //   Foundation, Inc
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19 #include "DefineVideoStreamTag.h"
  20
  21 #include <algorithm>
  22
  23 #include "RunResources.h"
  24 #include "VideoFrameTag.h"
  25 #include "VideoDecoder.h"
  26 #include "SWFStream.h" // for read()
  27 #include "movie_definition.h"
  28 #include "utility.h"
  29 #include "smart_ptr.h"
  30
  31 namespace gnash {
  32 namespace SWF {
  33
  34
  35 void
  36 VideoFrameTag::loader(SWFStream& in, SWF::TagType tag, movie_definition& m,
  37         const RunResources& /*r*/)
  38 {
  39     assert(tag == SWF::VIDEOFRAME);
  40
  41     in.ensureBytes(2);
  42     boost::uint16_t id = in.read_u16();
  43     DefinitionTag* chdef = m.getDefinitionTag(id);
  44
  45     if (!chdef)
  46     {
  47         IF_VERBOSE_MALFORMED_SWF(
  48             log_swferror(_("VideoFrame tag refers to unknown video "
  49                     "stream id %d"), id);
  50         );
  51         return;
  52     }
  53
  54     DefineVideoStreamTag* vs = dynamic_cast<DefineVideoStreamTag*> (chdef);
  55     if (!vs)
  56     {
  57         IF_VERBOSE_MALFORMED_SWF(
  58         log_swferror(_("VideoFrame tag refers to a non-video DisplayObject "
  59                 "%d (%s)"), id, typeName(*chdef));
  60         );
  61         return;
  62     }
  63
  64         // TODO: skip if there's no MediaHandler registered ?
  65
  66     const unsigned short padding = 8;
  67
  68         in.ensureBytes(2);
  69         unsigned int frameNum = in.read_u16();
  70
  71         const unsigned int dataLength = in.get_tag_end_position() - in.tell();
  72
  73     // FIXME: catch bad_alloc
  74         boost::uint8_t* buffer = new boost::uint8_t[dataLength + padding];
  75
  76         const size_t bytesRead = in.read(reinterpret_cast<char*>(buffer),
  77             dataLength);
  78
  79     if (bytesRead < dataLength)
  80     {
  81         throw ParserException(_("Could not read enough bytes when parsing "
  82                                 "VideoFrame tag. Perhaps we reached the "
  83                                 "end of the stream!"));
  84     }
  85
  86     std::fill_n(buffer + bytesRead, padding, 0);
  87
  88         using namespace media;
  89
  90     std::auto_ptr<EncodedVideoFrame> frame(
  91             new EncodedVideoFrame(buffer, dataLength, frameNum));
  92
  93         vs->addVideoFrameTag(frame);
  94 }
  95
  96 } // namespace SWF
  97 } // namespace gnash
  98